Suppression of PCDD/Fs by Raw Meal in Cement Kilns

Xiaoqing Lin; Longjie Ji; Mingxiu Zhan; Lingshu Wang; Tong Chen; Shengyong Lu; Xiaodong Li; Jianhua Yan

doi:10.4209/aaqr.2018.01.0023

Suppression of PCDD/Fs by Raw Meal in Cement Kilns

Xiaoqing Lin¹, Longjie Ji², Mingxiu Zhan This email address is being protected from spambots. You need JavaScript enabled to view it.¹^,3, Lingshu Wang¹, Tong Chen¹, Shengyong Lu¹, Xiaodong Li¹, Jianhua Yan¹

¹State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China
²National Engineering Laboratory for Site Remediation Technologies, Beijing Construction Engineering Group Environmental Remediation Co., Ltd., Beijing 100015, China
³College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China

Received: February 24, 2018
Revised: March 18, 2018
Accepted: March 18, 2018
Download Citation: ||https://doi.org/10.4209/aaqr.2018.01.0023

Download: PDF | Supplemental Material

Cite this article:

Lin, X., Ji, L., Zhan, M., Wang, L., Chen, T., Lu, S., Li, X. and Yan, J. (2018). Suppression of PCDD/Fs by Raw Meal in Cement Kilns. Aerosol Air Qual. Res. 18: 1032-1043. https://doi.org/10.4209/aaqr.2018.01.0023

HIGHLIGHTS

Raw materials can suppress the formation of PCDD/Fs.
The best ratio of MSW and raw material for PCDD/F suppression is 1:15.
NaCl and CuCl₂ have adverse effects on PCDD/F suppression.
MSW containing high levels of Cl and Cu is not good for co-processing.

ABSTRACT

Raw meal of the cement production process could probably suppress the formation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). In this study, these suppression effects were studied and compared during the co-processing of municipal solid waste (MSW) with conventional feed materials such as pure CaCO₃, and pure CaO. A top suppression efficiency of 96% was achieved for a ratio of MSW to raw meal of 1:15. Moreover, NaCl and CuCl₂ were added to the mix of feed material and MSW, to reveal the impact of additional chlorine and cations on PCDD/F formation. Similarly, the raw meal was mixed with the kiln dust to investigate possible suppression effects of those PCDD/Fs formed through the precursor or the de novo synthesis at a temperature of 350°C. The raw meal suppressed the formation of PCDD/Fs from kiln dust. Furthermore, the raw meal could not suppress the formation of PCDD/Fs on mixtures of kiln dust and NaCl or CuCl₂, which could be associated with a potential increase in the formation effects of PCDD/Fs on the raw meal. The results can help in potential decision-making on the applicability of certain cement kilns on the co-processing of MSW containing high levels of Cl and Cu.

Keywords: PCDD/Fs; Cement kiln; Raw meal; Suppression; MSW co-processing.